“We need assurances that these devices have not fallen into the wrong hands and, where appropriate, the MoD must tighten guidance to prevent future such incidents.”

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The MoD said it used secure encryption among other methods to stop potential criminals in their tracks.

It told the paper: “We have robust procedures to deter and prevent losses and thefts, whilst precautions like securely encrypting electronic devices ensure they cannot be accessed if they cannot be located.”